I have been thinking about this a little. As far as I understand, OpenCATS only currently has translations for Spanish and German.
However, I just installed a google translate Chrome extension I found here, https://www.google.com/url?sa=t&rct=j&q ... 81EzAqzxhw
And tested it out on our demo site: demo.opencats.org
Would you mind giving that a try and seeing if that is a reasonable option for you?
In the meantime, I'm going to look at the code and see how hard it would be to translate the interface. If it's something I can do, would you be willing to read it, and tell me what needs adjusting? I can't read Chinese